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US 9,868,266 B2Granted
Prepreg materials
AssigneeHexcel Holding GmbH
InventorJohannes Moser
Life of this patent
Estimating the term…
Abstract
Prepregs comprising fibrous reinforcing material and a heat curable resin are provided with a backing sheet whose surface has been treated to increase the surface tension which enhances the bonding between the prepreg and the backing sheet, and reduces resin removal when the backing sheet is removed. The use of the treated backing sheet also provides improved tack between prepregs when assembled in a stack for molding after removal of the backing sheet.
Claims13
A method where multiple layers of prepreg are formed into prepreg laminar structure that is cured to form a cured laminar structure, said method comprising the steps of:
- providing one or more layers of supported prepreg, said one or more layers of supported prepreg each comprising a prepreg and a backing sheet comprising a treated polymer fihn having an inner side that is in contact with said prepreg, wherein the inner side of said treated polymer film is formed by treating a polymer film with a sufficient amount of corona discharge or flame treatment to increase the surface tension of said polymer film;
- forming a prepreg laminar structure comprising said multiple layers of prepreg and one or more layers of said supported prepreg;
- heating said prepreg laminar structure for a sufficient time at a sufficient temperature to cure said prepreg laminar structure to form said cured laminar structure;
- and
- removing said backing sheet(s) from said cured laminar structure.
2 more elements
Dependencies are inferred from the claim text.